| | Plant species | OA anions secreted | Secretion pattern | Dose response | Temperature sensitivity | Effective inhibitors | References |
| | Acacia mangium | Citrate | NA | NA | NA | NA | [28] | | Acacia auriculiformis | Oxalate, citrate | NA | P | NA | NA | [51] | | Arabidopsis thaliana | Citrate, malate | NA | NA | NA | NA | [52, 53] | | Barley (Hordeum vulgare) | Citrate | I | A | P | NIF, A9C | [17] | | Buckwheat (Fagopyrum esculentum) | Oxalate | I | P | NA | PG | [19, 20, 39, 54] | | Cassia tora | Citrate | II | P | NA | CHM | [34, 39, 46] | | Citrus grandis and Citrus sinensis | Citrate, malate | I | P | P | CHM (malate), DIDS(1), A9C | [30, 31] | | Citrus junos | Citrate | II | P | NA | NA | [24] | | Deschampsia flexuosa | Malate | NA | NA | NA | NA | [55] | | Eucalyptus camaldulensis | Oxalate, citrate | NA | P | NA | NA | [51] | | Galium saxatile | Citrate | NA | P | NA | NA | [55] | | Lespedeza bicolor | Citrate, malate | II | P (malate), A (citrate) | NA | A9C, CHM | [29] | | Leucaena leucocephala | Citrate | NA | NA | NA | NA | [28] | | Maize (Zea mays) | Citrate, malate | NA | P | NA | NIF, DIDS(2) | [18, 56] | | Oxalate | NA | A | NA | NA | [8] | | Melaleuca cajuputi | Oxalate, citrate | NA | P | NA | NA | [51] | | Melaleuca leucadendra | Oxalate, citrate | NA | P | NA | NA | [51] | | Oat (Avena sativa) | Citrate, malate | NA | NA | NA | NA | [19] | | Oryza glaberrima | Citrate | NA | NA | NA | NA | [46] | | Paraserianthes falcataria | Citrate | NA | NA | NA | NA | [28] | | Pea (Pisum sativum) | Citrate | NA | NA | NA | NA | [46] | | Polygonum aviculare and Polygonum lapathiifolium | Oxalate | I | NA | NA | PG | [35] | | Poplar (Populus tremula) | Oxalate, citrate | NA | P | NA | NA | [57] | | Radish (Raphanus sativus) | Citrate, malate | NA | NA | NA | NA | [19] | | Rape (Brassica napus) | Citrate, malate | NA | NA | NA | PG | [19, 58, 59] | | Rice (Oryza sativa) | Citrate | NA | NA | NA | NA | [46] | | Rice bean (Viga umbellata) | Citrate | II | NA | NA | A9C, NIF, MA, PITC, CHM | [36] | | Rye (Secale cereale) | Citrate, malate | II | P | P | PP, PITC | [21] | | Rye | Citrate, malate | I (malate), | P | P (citrate) | NA |
[60]
| | II (citrate) | A (malate) | | Rumex acetosella | Oxalate | NA | P | NA | NA | [55] | | Snapbena (Phaseolus vulgaris) | Citrate | NA | NA | NA | NA | [61] | | Soybean (Glycine max) | Citrate, malate | II | P | NA | NA | [22, 23, 41] | | Soybean | Citrate | II | P | NA | A9C, CHM, MA | [62] | | Sorghum (Sorghum bicolor) | Citrate | NA | NA | NA | NA | [53] | | Spinach (Spinacia oleracea) | Oxalate | I | P | NA | NA | [35] | | Stylosanthes spp. | Citrate | II | P | NA | A9C, PITC, PG, NIF, DIDS(1), CHM | [63] | | Sunflower (Helianthus annuus) | Citrate, malate | NA | NA | NA | NA | [64] | | Taro (Colocasia esculenta) | Oxalate | NA | P | NA | NA | [65] | | Tobacco | Citrate | I | P | NA | NA | [40] | | Tomato (Lycopersicon esculentum) | Oxalate | I | A | NA | PG | [66] | | Triticale (×Triticosecale Wittmack) | Citrate, malate | II | P | NA | NA | [26] | | Veronica officinalis | Citrate | NA | P | NA | NA | [55] | | Viscaria vulgaris | Oxalate | NA | P | NA | NA | [55] | | Wheat (Triticum aestivum) | Malate | I | P | A | NIF, DPC, EA, A9C, NPPB, IAA-94 | [21, 37, 67, 68] |
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A: absent; A9C: anthracene-9-carboxylic acid; CHM: cycloheximide; DIDS(1): 4,4′-diisothiocyanatostilbene -2,2′-disulfonic acid; DIDS(2): 4,4′-dinitrostilbene-2,2′-disulfonic acid; DPC: diphenylamine-2-carboxylic acid; EA: ethacrynic acid; IAA-94, (6,7-dichloro-2-cyclopentyl-2, 3-dihydro-2-methyl-oxo-1H-inden-5-yloxy) acetic acid; NA: not applicable; MA: mersalyl acid; NIF: niflumic acid; NPPB: 5-nitro-2-(3-phenylpropylamino)-benzoic acid; P: present; PG: phenylglyoxal; PITC: phenylisothiocyanate;. PP: pyridoxal 5′-phosphate; anion channel inhibitors: A9C, NIF, PG; Citrate carrier inhibitors: MA: PITC, PP; protein synthesis inhibitor: CHM. Two patterns of Al-induced OA anion secretion can be identified on the basis of the timing of secretion. In Pattern I plants, no discernible delay is observed between the addition of Al and the onset of OA anion secretion. In Pattern II plants, OA anion secretion is delayed for several hours after exposure to Al.
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